Eraser for a pencil



FIG. 1 is a perspective view of an eraser for a pencil;

FIG. 2 is an elevation view thereof;

FIG. 3 is a top plan view thereof; and,

FIG. 4 is a bottom plan view thereof.

The broken lines showing the inside surface in FIG. 4 represent environmental matter and form no part of the claimed design. 

The ornamental design for an eraser for a pencil, as shown. 